Lubricating means for sewing machine loop takers



Sep t.29,1942. s, 205115 2,297,665

LUBRIGATING MEANS FOR SEWING MACHINE LOOP-TAKERS Filed Nov. 5, 1940 awe/whorl v S ydmsgy Janis Wi lie; v

Patented Sept. 29, 1942 LUBRICATING MEANS FOR SEWING MACHINE LOOP TAKERS Sydney Zonis, Stratford,.Cnn., assignor to The Singer Manufacturing Company, Elizabeth,

N. J., a corporation of New Jersey Application November 5, 1940, Serial No. 364,394

4 Claims.

This invention relates to rotary loop-takers for sewing machines of the type in which a threadcarrier is journaled in a raceway formed in the body of the loop-taker, the invention having for its object to provide simple but effectivemeans for supplying lubricant to the loop-taker raceway.

With these and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter described in connection with the accompanying drawing, which illustrates a preferred embodiment of the invention and in which:

Fig. 1 is a view in front elevation and partly H in vertical section, of a portion of a sewing machine containing the present improvement. Fig. 2 is a front end elevation of the loop-taker, with the thread-carrier removed therefrom.

The sewing machine shown in the drawing is, in general, substantially the same as the machine more fully disclosed in' my prior patent application Serial No. 312,247, filed Jan. 3, 1940.

The sewing machine has the usual frame including a work-supporting bed-plate I provided with a throat-plate 2 having an aperture 3 for a vertically reciprocatory needle 4 carried by a needle-bar 5. The work is advanced by a feeddog 5, operating through slots in the throat-plate 2 and actuated in any usual or suitable manner.

Depending from the bed-plate l is a bearinglug 1 comprising one end wall of a lubricant-res ervoir 8. The bearing-lug 1 has a horizontally extending aperture 9 in which a bearing-bushing ll! is secured by a screw II for endwise adjustment. The horizontally extending aperture I2 of the bushing IE3 is provided with spaced needle-bearings l3 and I4. Journaled in the needlebearings l3, I4 is a horizontally disposed and rotary loop-taker shaft l5 provided with a longitudinal bore l6 extending, in the present instance, throughout the length of the shaft. One end of the loop-taker shaft l5 extends into the lubricant-reservoir 8 and may be connected in any usual or suitable manner to actuating mechanism (not shown) adapted to rotate said shaft. Preferably, the loop-taker shaft is driven by actuating mechanism such as fully illustrated and described in my prior patent application Serial No. 312,247, whereby the shaft L5 is rotated twice for each complete needle-reciprocation.

The opposite end of the loop-taker shaft [5 extends beyond the bushing l0, and secured upon that end of the shaft [5, by a screw I I, is the hollow hub l8 of a loop-taker I!) of the rotary hook type and complemental to th needle 4 in the formation of lock-stitches. The loop-taker It has a cup-shaped body provided, in the inner face of the generally cylindrical side wall thereof, with an annular thread-carrier raceway 2&3.

Journaled in the loop-taker raceway 20 is the peripheral bearing-rib 2| of a thread-carrier 22 restrained against rotation with the loop-taker by any usual or suitable means. The thread-carrier bearing-rib2l is confined in the raceway 20 by the usual gib 23, and the side wall of the loop-taker is partly cut away to provide a needle-thread loop seizing beak 2-4.

The loop-taker I9 is preferably constructed so that the shaft aperture 25 of the hollow hub l e-extends through the bottom wall 25 of the loop-taker. The bottom wall 26 of the loop-taker is recessed in the hub-aperture thereof to receive fixedly a disk 2'! disposed axially of the loopta-ker and substantially flush with the inner face of the bottom wall thereof. The disk 21 forms a closure for one end of the shaft-aperture 25 of the hub and constitutes, in effect, a portion of the bottom wall of the loop-taker body. The loop-taker is preferably secured upon its shaft l 5 so that the bottom-wall disk 21 of the loop-taker is spaced from the end of the shaft l5, thereby providing a hub-cavity between the shaft and disk. The disk 21 is provided with apertures 28 connecting the hub-aperture'25 of the loop-taker with the inner face of the loop-taker body, whereby lubricant supplied to said aperture 25 passes through the disk-apertures 2-8 in directions parallel to the axis of rotation of the loop-taker and is thereby delivered directly to the inner face of the loop-taker. The disk-apertures 28, preferably two in number, are constricted with respect to the bore 56 of the loop-taker shaft and are radially ofifset from the axis of rotation of the loop-taker, as well as from the bore is of the loop-taker shaft; said apertures 28 being preferably spaced from each other diametrically of the disk 2'1. While it is preferred to employ the apertured disk 21, set into the body of the loop-taker, it is to be understood that the disk portion of the loop-taker may be formed integral with the loop-taker body.

Extending through the longitudinal bore of the loop-taker shaft i5 is a lubricant-conducting wick 29. of which one end extends beyond the end of the shaft 15 into the loop-taker hub-cavity and preferably into contact with the disk 21 between the apertures 28 thereof. Lubricant is supplied to the other end of the wick 29 from the reservoir 8 in the manner fully described in my prior patent application Serial No, 312,247. The wick 29 conducts the lubricant lengthwise of the shaft l and thereby delivers lubricant to the hub-cavity 25 and to the apertures 28 of the disk 21. The wick 29 serves to control the quantity of lubricant supplied to the disk-apertures 2B, and the offset constricted apertures 28 further control the delivery of the lubricant to the inner face of the bottom wall 28 of the looptaker, along which face the lubricant is impelled by centrifugal force and thence passes along the side wall of the loop-taker to the threadcarrier raceway.

The improvement described therefore provides controlled means for delivering lubricant directly from the bore and substantially axially of the loop-taker shaft to the inner face of the loop-taker body, thereby obviating the necessity of providing radial and other special lubricantguiding ducts heretofore employed in devices of this general character.

Having thus set forth the nature of the invention what I claim herein is:

1. In a sewing machine having stitch-forming mechanism including a rotary loop-taker shaft provided with a longitudinal bore open at one end of said shaft, a loop-taker having an axially apertured hub and a cup-shaped body comprising a generally cylindrical side wall and a bottom wall, means for securing said loop-taker upon said open end of the loop-taker shaft with the bottom Wall of the loop-taker disposed in spaced relation to said end of the shaft, thereby to provide in the hub of the loop-taker a lubricantcavity closed at one end by a portion of said bottom wall of the looptaker, said side wall of the loop-taker body being internally provided with a thread-carrier raceway, and a thread-carrier journaled in said raceway and restrained against rotation with said loop-taker, the improvement which consists in the provision in the hub-cavity end closure portion of the bottom wall of said loop-taker of a lubricant-conducting aperture connecting said lubricant-cavity with the inner face of said loop-taker in a direction substantially parallel to the axis of rotation of the looptaker, said lubricant-conducting aperture being constricted relatively to the bore and offset from the axis of rotation of said shaft, and a lubricant-conducting wick disposed in the bore of said shaft and having one end thereof disposed in contact with the outer face of the bottom wall of the loop-taker adjacent the aperture in said bottom wall.

2. In a sewing machine having a rotary looptaker shaft lengthwise provided with a lubricantconducting bore open at one end of said shaft, a rotary loop-taker having a cup-shaped body including a bottom wall provided with a hollow hub carried by the open-bore end portion of said shaft, said bottom wall of the loop-taker body having a portion thereof forming a closure for one end of said hollow hub, and a thread-carrier journaled in said loop-taker body and restrained against rotation therewith, the improvement which consists in the provision in the hub end-closure portion of said bottom Wall of a lubricant-conducting aperture connecting the hollow of said hub with the inner face of said loop-taker bottom wall, said lubricant-conducting aperture extending lengthwise of said shaft.

3. In a sewing machine having a rotary looptaker shaft lengthwise provided with a lubricantconducting bore open at one end of said shaft, a rotary loop-taker having a cup-shaped body including a bottom wall provided with a hollow hub carried by the open-bore end portion of said shaft, said bottom wall of the loop-taker body having a portion thereof forming a closure for one end of said hollow hub, and a thread-carrier journaled in said loop-taker body and restrained against rotation therewith, the improvement which consists in the provision in the hub endclosure portion of said bottom wall of a lubricant-conducting aperture extending lengthwise of said shaft and connecting the hollow of said hub with the inner face of said loop-taker bottom wall, said lubricant-conducting aperture being radially offset from the axis of rotation of said loop-taker and being constricted relatively to the bore of said shaft.

4. In a sewing machine having a rotary looptaker shaft lengthwise provided with a lubricantconducting bore open at one end of said shaft, a rotary loop-taker having a cup-shaped body including a cylindrical side wall and a bottom Wall, said side wall being internally provided with a thread-carrier raceway and said bottom wall having a hollow hub carried by the open-bore end portion of said shaft, a thread-carrier journaled in said raceway and restrained against rotation with said loop-taker, and a disk carried by said bottom wall of the loop-taker and forming a closure for one end of said hollow hub, the improvement which consists in the provision in the hub end closure disk of a plurality of lubricant-conducting apertures radially offset from the axis of rotation of said loop-taker and connecting the hollow of said hub with the inner face of said loop-taker bottom wall, said lubricantconducting apertures extending lengthwise of said shaft.

SYDNEY ZONIS. 

